This notebook covers the period August-October 1886. Most of the entries are by Ezra T. Gilliland. There is also one entry by Edison about telephone experiments. The notes and drawings by Gilliland concern telephones, a railway telegraph and telephone, and phonograph experiments. Included also is a set of undated drawings, probably by John F. Ott, for a village system generator. The spine is labeled "31." The book has been used in both directions. At one end of the book are 50 numbered pages preceded by one unnumbered page. The six pages of entries at the other end of the book are unnumbered.